James m



(No Model.)

J. M. CUNNINGHAM.

ADJUSTABLE BIT.

No. 411.953. Y Patented oct. 1. 1889..

N. Pinks. Phex-Lhhogmhar. wuhingnan. uc.

UNTTED STATES PATENT Trice.

JAMES M. CUNNINGHAM, OF IEWISBURG, VEST VIRGINIA, ASSIGNOR OF ONE-HALF TO JOHN F. ESTILL, OF SAME PLACE.

ADJUSTABLE BIT.

SPECIFICATION forming part of Letters Patent N 0. 411,953, dated October 1, 1889.

Application filed September 26, 1888- Serial No. 286,463 (No model.)

To @ZZ whom it may concern.-

Be itknown that I, JAMES M. CUNNINGHAM, a citizen of the United States, residing at Lewisburg, in the county of Greenbrier and State of lVest -lirginia, have invented new and useful Improvements in Adjustable Bits, of which the following is a specification.

The invention relates to improvements in adjustable bits to be used with mortising-m achines and adapted to cut tenons of different sizes; and it consists in the construction and novel combination of parts hereinafter' described, illustrated in the accompanying drawings, and pointed out in the claims.

In the drawings, Figure l is a perspective view of a bit embodying theinvention, which bit is made in two sections. Fig. 2 is a perspective view of the smaller section of the bit. Fig. 3 is a rear elevation of the bit.

Referring to the drawings by letter, A designates the larger section of the bit provided with the leg B,having a beveled cutting-edge b at its end. The said section has the body O and the neck e for insertion in the chiselrod of any mortising-machine, the body having a straight lower edge c', that stands at right angles to the leg B.

D is the second or smaller section of the bit, composed of a leg E, similar to the leg ll, and having a similar beveled cutting-edge e, and the two parallel arms F G, standing at right angles to the leg, the arm F extending from the upper end of the leg and the arm G from a point a suitable distance below the former. The said armsF Gr are respectively provided with the longitudinal slots j' g, and move in the grooves Il and I in the leg ll, the former of which is adjacent to the straight edge e and the latter below it.

h and i are threaded openings in the grooves II and I, and .l and K are set-screws passing through the slots f and y and engaging said openings. By means of said slots and screws the legs D and E, which have their cuttingedges aligned, can be moved nearer together or farther apart to eut tenons of different widths.

The meeting edges of the body C and arm F are preferably rabbetcd at Il, where they are fitted together.

The operation of the bit is obvious, as-it may be used with any style of inortising-machine, and will cut tenons of any desired length or width.

Having described my invention, I claiml. The combination, with the section A, having the leg B and provided with the grooves H and I, of the section D, having the leg E, provided with the slotted arms F and G, and the set-screws J and K, substantially as described.

2. In abit, the combination, with the section A, having the leg B, provided with the bevel cutting-edge l), the body C, the neck o, and the slots Il and I, of the section D, having the leg E, provided with the euttingfedge e and the slots f and g in its arms F and G, and the set-screws J and ITI, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixed niysignaturein presence of two witnesses.

J AS. ill. CUNNINGHAM.

lVitnesses:

F. M. PUNICK, L. J. WILLIAMS. 

